docs: def add_options(self):
          """ Add program options.
          """
          super(RtorrentSweep, self).add_options()
  
          # basic options
          self.add_bool_option("-n", "--dry-run",
              help="do not remove anything, just tell what would happen")
          self.add_value_option("-p", "--path", "PATH",
              help="path into the filesystem to sweep (else the default download location)")
          self.add_value_option("-r", "--rules", "RULESET [-r ...]",
              action="append", default=[],
              help="name the ruleset(s) to use, instead of the default ones")